Cheats for Doom (GBA)

God mode
Pause the game, then hold L + R and press
A, A, B, A, A, A, A, A.

Computer map
Pause the game, then hold L + R and press
B, A, A, A, A, A, A, A.

Radiation suit
Pause the game, then hold L + R and press
B, B, A, A, A, A, A, A.

Advance to anonter level
Pause the game, then hold L + R and press
A, B, A, A, B, B, A, A.
- You will advance about 5 levels, depending where you are.

Tower Of Babel level
Pause the game, then hold L + R and press
A, B, A, B, A, B, B, A.

All weapons, items and keys
Pause the game, then hold L + R and press
A, B, B, A, A, A, A, A.

Invincibility
Pause the game, then hold L + R and press
B, B, B, A, A, A, A, A.

Berserk mode
Pause the game, then hold L + R and press
B, A, B, A, A, A, A, A.